Grinding-machine.



G. LARSON.

GRINDING MACHINE.

APPLICATION FILED PEBJQ, 1909.

939,088. Patented NW2, 1909.

. I3 3 SHEETS-SHEET 1.

1 "if, y @j ym, 361A Vw G. LARSON. GRINDING MACHINE.

APPLICATION FILED FEBJQ, 1909.

l Patented'Nov. 2, 1909.

3 SHEETS-*SHEET 2.

@Wi/knew@ G; LARSON. GRINDING MAGHINE. APPLICATION FILED FEBJQ, 1909.

939,038. Patented Nov; 2, 1909.

3 SHEETS-SHEET 3.

GOTTFRID LARSON, OF JAMESTOWN, NEW YORK.

GRUNDING-MACHINE.

. S-pecication of Letters Tetent.`

Patented Nov. 2, 1909.

Application led February 19, 1909. Serial No. 478,784@

To all whom it may concern:

Be it known ythat I, Gorrrnm LAnsoN, a

citizen of the United States, residing at *p Jamestown, in the county ofChautauqua and State of New York, have invented certain new and usefulImprovements in Grinding-Machines; and I do declare the following torfoea full, clear, and eXactdescription of the invention, such as will`enable others The object of the invention is .to provide 'a grindingmachine which may be moved back and forth by hand over .the surfacebeing' oundy or polished or which may be securedTuponfa bench or tableand the work engaged therewith.

A further object is to provide a device of this character adapted to beoperated by means of compressed air and having means whereby after theair has been employed for operating the grinder, said air may beutilized for blowing the dust from the surface being ground or polished.

With these and other objects in view, the invention consists of certainnovel features of construction, combination and arrangement of parts, aswill be more fully .described and particularly pointed out `in theappended claims.

In -the accompanying drawings, Figure 1 is a plan View of the grinderwith arts broken away; Fig. 2 is a side view o the same partly insection; Fig. 3 is a ,vertical sectional view Von the line 3 3 of Fig.l; Fig. 4 is a vertical cross sectional view through the operatingwheel; Fig. 5 is a sectional view taken through certain parts of F' l'.Fig. Gis a top plan view of a modi ed form vof the grinder, parts ofythe latter being broken away; Fig. 7 is a side view of the same withparts broken away; Fig. 8 is a cross sectional view of Fig. 6; Fig. 9 isa side view of another modified form of the device; and Fig. 10 is ahori zontal sectional view of the same. v

Referring more particularly to Fig.1 to 5 of the drawing, 1 denotes thegrinder which consists of a handle portion 2 having on its outer end aforked head 3, one member 4 of which is dctachably secured tothe head bya set screw 5 or other suitable fastening mechanism, whereby said membermay be removed to permit the insertion or removal of the grinding wheel.On the opposite member 6 -of the forked head is arranged a suitablesupporting frame 7 in `which is mounted the operating mechanismhereinafter described.

In the outer ends of the members 4 and of the head are formed bearings 8in which is revolubly mounted a vertically disposed grinding andpolishing wheel 9. a The wheel 9 is mounted on an axle 10 and 'sdetachably secured thereto by a jam .nut -12 which clamps the same intoenga ement with the flange or collar 13 on the s aft as shown. In oneend of the shaft l() is formed a socket'14 adapted to receive a drill orboring-bit. On the opposite end of the shaft 10 is fixedly mounted abevel gear pinion 15 which is engaged by a similar pinion 16 mounted onthe lower end of an operating shaft 17 which is mounted in a suitablebearing in the frame 7 of the grinder. On the shaft 17 is also tixedlymounted a bevel gear pinion 18 which is adapted to mesh with a bevelgear pinion 19 mounted on the inner end of adrive shaft 20 which is alsorevolubly mounted in a suitable bearing on the frame 7.

On the drive shaft 20 is ixedly mounted an operating Wheel or turbine 21which is inclosed in a suitable casing 22 arranged on the frame 7. Withthe casing 22 is connected a flexible air supply pipe 23 wherebycompressed air is conducted to the casing and applied to the wheel 21thereby driving the same and the shaft 20. The movement of the shaft 20is imparted to the grinding wheel through the operating mechanism hereinbefore described.

On the operating shaft 17 is arranged a governor mechanism which is heres ow'n and preferably consists of a pair of governor balls 24 which arepivotally mounted on one of the bearing brackets of the shaft 17 .andare provided adjacent to their pivotal connections with offsetprojections 25 which are adapted to engage a collar 26 which is slidablymounted on the shaft 17 and with which is connected the forked end of avalve operating lever 27 which is pivotally mounted on a suitable4bearing in the frame 7. The opposite end of the lever 27 is connectedby van operating rod'28 to the stem 29 of a ro- 4valve operating lever27, while the opposite end of the spring is engaged with a shoulderedadjusting rod 32, the outer end of which has a screw threaded engagementwith a spring adjusting bar 33 which is slidably mounted in a sultablebearing 34 in the frame 7. Connected with the free end.

of the adjusting bar 33 is a lever 35, onel endl of which is pivotally-mounted in the frame 7, while the upper end projects through a slotformed in the hood or casing 36 of the operating lmechanism and isprovided with an operatingl knob or handle. 37.4 On the handle 37 isarranged a fixed pawl or-tooth 38 which is adapted t'o be engaged withthe teeth of a segmental rack39 arranged on the casing 36 whereby thelever 35 may be held in its adjusted position to regulate the tension ofthe spring 31 as will be understood. By regulating the tension of thespring 31 thesame will bear with greater or less pressure against thefree end of the valve operating lever 27 and thus hold said lever moreor less firmly against operation by the go\'. ernor balls so that -thespeed at which said governor balls operate to cut 0H the air supply maybe regulated. Connected with the v casing 22 of the 'turbine wheel is anair discharging tube 40, the outer end of which flares to substantiallythe width of the grinding wheel and is disposed in close proximity tothe surface of the object bein ground whereby the discharge air from tiecasing 22 is utilized to blow the dust from the sur-- face being roundor polished.

The han le 2 is preferably supported'by means vof an adjustablesupporting mechanism comprising a base plate 41 the forward end of whichis hingedly connected to a front adjusting rod 42 which preferably has ascrewl threaded engagement with a socket 43 formed in the forward end ofthe handle. The rear end of the base plate 41 is provided with arearwardly projecting dove-tail extension 44'with which 1s slidablyengaged a foot piece 45 to which is hingedly connected the lower end ofa rear adjusting rod 46 which is slidably engaged with a passage 47formed in the rear en of the handle; The rod 46 is provided-With aseries of Worm gear teeth 48 with which is adapted to be engaged a wormgear 49 formed o n the upper end of a handle 50 which is revolublymounted on a shank 51 which is preferably an extension of the rear endof the handle 2. By revolving the handle 50 in one direction or theother the worm gear thereon will enmodified form of grinder in which ahorizontally disposed grinding wheel is employed. The grinder shown inthe last mentioned figures consists of a handle portion 52 on .theforward end of which is arranged a supporting frame 53 provided in itsouter end with a vertically4 disposed bearing 54 in which is mounted ashaft 55 on the lower end of which is secured a grinding wheel 56 havingon its lower face an abrasive surface. The center of the wheel 56 isrecessed to receive the lower end of the shaft 55 on which is screwed aclamping nut 57 to secure said wheel in place. In the lower end of theshaft 55 is formeda socket 58 to receive a drill or boring-bit.

On the upper end of the shaft 55' is fixedly mounted a bevelfgear 59with which is engaged a bevel gear pinion 60 on the operating shaft 6lwhich is mounted in suitable bearings in the frame of the machine. Onthe shaft 61 is also ixedly mounted a bevel gear 62 which engages abevel gear pinion 63 on the end of a drive shaft 64 on which is mountedan operating Wheel or turbine 65 and is adapted to receive a current ofcompressed air whereby the same is driven in the same manner asdescribed in connection with the operating wheel shown in the first fivefigures of the drawing. j

The operating mechanism shown in Figs. 6, 7 and 8 is provided with agovernor mechanism 67 and a valve regulating mechanism 68 which issimilari in construction to that shown in connection with the firstfigures of the drawing and a description of the same is not thought tobe necessary.

The o erating 'mechanism is preferably covered y a hood 69 and thehandle 52 is adjustably engaged with a supporting mechanism70'compr1sin0f a base plate 71 having at its opposite ends u wardlyprojecting supporting posts or ro s 72 in which are formed a series oftransversely disposed screw holes 73 with one of which is adapted to beengaged set screws 74 which pass through inclined slots 75 in alongitudinally disposed adjusting bar 76 which is slidably mounted in aroove or channel 77 formed in the side of t e handle and is provided onits outer end with a threaded extension 78 on which is screwed anadjusting sleeve or handle 79 the forward end of which has a swiveledconnection 80 with a swivel head 8l arranged on the rear end of thehandle as shown. By thus en aging the adjusting sleeve with the threa edextension 78 of the handle and the grinding wheel on the sup# portingplate 7l and posts 72- thus engaging or disengagmg the grinding wheelfrom the work.

In Figs. 9 and l0 of the drawing is shown a similar form of the grinderin which the turbine wheel is directly connected to the shaft of thegrinding wheel. The form of the device shown in Figs. 9 and 10 comprisesa tubular handle portion 82 on the outer end of which is formed abearing head 83 provided wit-h a horizontally dis osed Abearing aperturein which is revo ubly mounted an operating shaft 84 on one end of whichis mounted a grinding wheel 85, while on its opposite end is mounted atur bine wheel 86 arranged in a suitable casing 8,7. vWith one side ofthe casin 87 is connected an air supply 'pipe 89 which connects at itsopposite end with a tubular handle 82 to which is secured a flexible airconducting pipe not shown. By this arrangement the compressed air isconducted to the fan and the grinding wheel thus directly operated. Thewheel casing 88 is provided with'ran eX- haust tube 90 by which theexhaust air is conveyed to the surface being ground to blow the dust anddirt therefrom.

The handle 82 is provided near its outer end with a vertically disposedpassage 91 with which is engaged a supporting bar 92 provided on itslower end with a segmental foot 93 which engages the surface beingground and thereby supports the machine which may be readily tilted bymeans of .the segmental foot 93. The handle is adjustably secured tothesupport 92 by means of a set screw 94 or other suitable fasteningdevice.

From the foregoing description, taken 1n connection with theaccompanying drawings, the construction and operation of the inventionwill be readily understood Without requiring a more extendedexplanation.

Various changes inthe form, proportion4 and the minor details ofconstruction mayV be resorted to without departing from the principle orsacrificing any of the advantages of this invention as defined in theappended claims. y i

Having thus described and ascertained the nature of my invention, what Iclaim as new and desire to secure by Letters-Patent, is

v1. In a device of the character described a handle, a grinding wheelrevolubly mounted in the outer end ofsaid handle, a turbine wheelcarried by said handle, an operating mechanism to connect said turbinewheel with said grinding wheel, meansto` regulate the speed of saidoperating meehanism and the wheel, -a handle supporting mechanism andmeans to adjustably conneet the handle with said supporting mechanismwhereby the grinder may be tilted to engage the grinding wheel withuneven surfaces.

2. In a grinding machine of the character described, a supportinghandle. a grinding wheel revolubly mounted in said handle,

an operating shaft geared to said grinding wheel, a turbine wheelcarried by said handle and geared to said operating shaft whereby thelatter and said grlnding wheel are driven, a casing arranged around saidturbine wheel, a fluid supply pipe connected to said casing, acontrolling valve in said supply pipe, a 8G valve controlling mechanism,a governor mechanism arranged on said operating shaft and connected tosaid valve controlling mechanism and means to regulate said governormechanism 'whereby the speed of the grinding wheel is determined.

3. In a grinding machine of the character described, a supportinghandle, a grinding wheel revolubly mounted in said handle, an operatingshaft geared to said grinding wheel, a turbine'wheel carried by saidhandle and geared to said operating shaft, a Huid supply pipe connectedwith said turbine, a, controlling valve arranged in said pipe, a valveregulating mechanism, a centrifugal governor mechanism arranged on saidoperan ing shaft and connected with said valve regulating mechanism, aspring engaged with said governor to regulate the movement of the same,and an adjusting lever connected with said spring whereby the tension ofthe same is regulated and the speed of the grinder thereby controlled.

4. In a grinding machine of the character described, a supportinghandle, a grinding wheel revolubly mounted in said handle, means todetachably secure the wheel in operative position in the handle, meanswhereby a drill may be operated by the shaft of said grinding wheel, anoperating mechanism geared to said grinding wheel, a compressed airturbine geared to said operating mechanism, a speed controlling andregulating mechanism and means whereby the eX- haust air from theturbine is employed to .a handle support-ing mechanism, said mechanismcomprlsing ay base plate, a supporting rod hingedly connected to theforward end of said-plate and having a threadedengagement with saidhandle, a foot piece slidably .engaged Withthe rear end of said baseplate,

a rear siipportingbar hingedly connected to said foot piece and slidablyengagedwith, the rear y'end of the handle, worm gear teeth arranged onsaid bar, a revolubly'mounted 130 adjusting sleeve, and a worm gear on.said my hand in presence of two subscribing leevehto eglgage the teeth(n aid mijlusting witnesses. v

ar w ere y the rear en o t e han e may be raised or lowered therebytilting the for GOTTFRID LARSON' 5 ward end yof the same and thegrinding Witnesses:

wheel mounted therein. JOHN JOHNSON, In testimony whereof Ihave'hereuntp set EMIL JoNiae.l

